Friday, September25, 2020
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Marine Weather and Tides
Elmhurst, IL

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:41AMSunset 6:44PM Friday September 25, 2020 7:27 PM CDT (00:27 UTC) Moonrise 3:55PMMoonset 12:10AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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LMZ741 Expires:202009260315;;354298 Fzus53 Klot 251956 Nshlot Nearshore Marine Forecast National Weather Service Chicago/romeoville Il 256 Pm Cdt Fri Sep 25 2020 For Waters Within Five Nautical Miles Of Shore On Lake Michigan Waves Are Provided As A Range Of Significant Wave Heights, Which Is The Average Of The Highest 1/3 Of The Waves, Along With The Average Height Of The Highest 10 Percent Of The Waves Which Will Occasionally Be Encountered. Lmz740>742-260315- Winthrop Harbor To Wilmette Harbor- Wilmette Harbor To Northerly Island- Northerly Island To Calumet Harbor- 256 Pm Cdt Fri Sep 25 2020
.small craft advisory in effect from Saturday afternoon through late Saturday night...
Tonight..Southeast winds 10 to 15 kt turning south. Mostly clear. Waves 1 to 3 ft.
Saturday..South winds 10 to 20 kt increasing to 30 kt in the afternoon. Mostly Sunny. Waves 1 to 3 ft building to 2 to 4 ft in the afternoon.
Saturday night..South winds to 30 kt becoming southwest 15 to 25 kt after midnight. Partly cloudy in the evening then becoming mostly cloudy. Waves 3 to 5 ft.
Sunday..Southwest winds 10 to 15 kt becoming northwest 10 to 20 kt in the afternoon. Chance of showers in the afternoon. Waves 1 to 3 ft subsiding to 1 ft or less in the afternoon.
LMZ741


7 Day Forecast for Marine Location Near Elmhurst, IL
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location: 41.89, -87.94     debug


Area Discussion for - Chicago, IL
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FXUS63 KLOT 260001 AFDLOT

Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 701 PM CDT Fri Sep 25 2020

SHORT TERM. 225 PM CDT

Through Saturday night .

A summer time breeze has picked up across the area this afternoon and is a bit of a precursor of things to come. Main weather concerns are the warm temperatures and breezy/windy conditions on Saturday.

The upper level flow across the northern tier of the United States is certainly looking a bit more active upstream with a upper jet slamming into the Pacific northwest and this will begin to dig a upper trough across the upper Midwest. But before we jump ahead, the pressure gradient is increasing ahead of a lead upper low across north central Manitoba. This gradient will remain firm and increase as the upper jet spread into the upper Midwest and spin up a surface low across the plains on Saturday. Strong southwest flow will not only pump in some summer-like mid 80s highs tomorrow, but expect winds to pick up a tad, with gusts of 30-35 mph certainly plausible in this regime. Highest winds will be in the mid to late afternoon. Model RH fields suggest 35-40 percent on the lower end. Given the dry fuels and breezy conditions, some limited fire weather concerns do still exist -- and could be more elevated if dewpoints were a bit lower.

Saturday night will continue the breezy and unseasonably mild conditions from the daytime hours as strengthening low pressure (merging areas of low pressure) quickly tracks from western Wisconsin to near James Bay by Sunday morning. Ahead of the trailing cold front, south to southwest winds will gust to 25-35 mph through the evening and the early overnight. Overnight lows will be summer- like in the lower to mid 60s outside Chicago and upper 60s downtown.

KMD

LONG TERM. 306 PM CDT

Sunday through Friday .

While there continues to be high confidence that we will turn to a much cooler and more unsettled weather pattern next week as a pattern shift occurs, there continues to be somewhat lower confidence with the day-to-day specifics, especially mid to late next week.

On Sunday we will have a cold frontal boundary shifting southeastward across the area. This will result in our coolest temperatures (in the low to mid 70s) over far north central and northwestern IL, and our warmest readings (low 80s) over my east central IL and northwestern IN counties. While the front itself should move through mainly precipitation free, this does not appear to be the case in its wake. Increasing large scale forcing for ascent (attendant to the digging upper trough over the Upper Midwest) late Sunday into Sunday night looks likely to complement a strengthening lower level frontogenetic circulation along the lingering baroclinic zone. This should support an area of post frontal rain developing over the area, first over northwestern and parts of far north central IL Sunday afternoon, then across the rest of the area Sunday evening and night. It appears that some a good soaking rain could occur with this activity into Monday morning, before the upper trough axis and lower-level baroclinic zone shift to our east during the day Monday.

Lingering cloud cover and a cool airmass overhead should keep temperatures in the 60s for daytime highs on Monday. It does appear the main threat for more widespread rain may come to an end early Monday, with the possibilities for only some occasional widely scattered showers thereafter through midweek. With this in mind, I limited POPs to low end chance during this period.

Temperatures should remain in the 60s again Tuesday, but there are some signs that the temperatures around Wednesday could warm briefly before another reinforcing shot of cold air shifts back over the area later in the week as another significant impulse looks to top the western CONUS ridge and dig in over the Great Lakes. This could result in another good chance for showers on Thursday, with temperatures potential remaining in the 50s for the late week period.

KJB

AVIATION. For the 00Z TAFs .

Primary concerns through the TAF period:

* Gusty south southwesterly winds Saturday * Low potential for MVFR (or lower) stratus Saturday AM

Winds have eased this evening but will likely remain elevated around 10 kts overnight as the low level jet sets up over the area which could allow for occasional gusts to mix down. Surface winds are currently expected to remain high enough to preclude a formal mention of low level wind shear in the TAF but will note the marginal LLWS potential overnight and again tomorrow night.

A region of MVFR stratus across southern Illinois may try to lift north into the area toward daybreak. Have opted to add a FEW020 mention to hint at this potential. Current thinking is this will remain southeast of the terminals. Will continue to watch this for later TAF updates.

After daybreak, winds are expected to quickly ramp up out of the south southwest as the pressure gradient tightens and stronger gusts mix down to the surface. Expect gusts in the upper 20kt range to near 30kt possible at times during the afternoon hours. Winds will likely remain elevated into the evening hours before easing overnight.

Petr

LOT WATCHES/WARNINGS/ADVISORIES. IL . None. IN . None. LM . Small Craft Advisory . LMZ740-LMZ741-LMZ742-LMZ743-LMZ744- LMZ745 . noon Saturday to 4 AM Sunday.



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FSTI2 17 mi88 min S 13 77°F
OKSI2 17 mi88 min ESE 2.9 G 4.1 78°F
CNII2 18 mi28 min S 6 G 12 75°F 51°F
CHII2 - Chicago, IL 20 mi38 min S 17 G 18 76°F 59°F
45174 23 mi28 min SE 9.7 G 12 69°F 66°F1 ft1010.8 hPa (-0.9)64°F
CMTI2 - 9087044 - Calumet, IL 24 mi58 min S 5.1 G 12 77°F 1011.7 hPa55°F
WHRI2 - Waukegan Harbor, IL 33 mi88 min S 8 G 11
45187 42 mi68 min SSW 7.8 G 14 69°F 66°F1 ft
KNSW3 - Kenosha, WI 49 mi88 min S 13 G 15 68°F 1011.2 hPa (-1.0)

Wind History for Calumet Harbor, IL
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicago, Chicago-O'Hare International Airport, IL7 mi37 minS 710.00 miPartly Cloudy77°F54°F45%1011.1 hPa
Chicago, Chicago Midway Airport, IL12 mi35 minS 610.00 miA Few Clouds77°F52°F42%1011.1 hPa
Chicago / Wheeling, Pal-Waukee Airport, IL15 mi36 minS 710.00 miFair75°F55°F50%1011.5 hPa
Chicago / West Chicago, Dupage Airport, IL17 mi36 minS 710.00 miFair71°F57°F61%1011.2 hPa
Lewis University Airport, IL21 mi53 minS 610.00 miFair72°F57°F61%1012.2 hPa

Link to 5 minute data for KORD

Wind History from ORD (wind in knots)
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Last 24hrS4SW3S4S4S3S5S5S5SW6SW5SW6SW5SW4SW4SW8SW8S11S12
G20
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1 day agoSW7SW5SW5SW5SW4S4S7S6SW5S4SW4SW5SW5SW7SW6SW6W9SW7SW8SW11SW9S5SW4S4
2 days agoS4SW4SW6SW6W4W5SW6W5SW3SW4SW5SW4SW4W5W5SW55W8W10W5
G14
SW8S7SW5SW5

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Ground Weather Radar Station Chicago, IL
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